/Engine/Source/Runtime/MovieScene/Public/Evaluation/MovieSceneEvaluationState.h
Does not clear the existing cache
The object's spawnable or possessable GUID, or a zero GUID if it was not found
[FGuid](API\Runtime\Core\Misc\FGuid) FindCachedObjectId ( [UObject](API\Runtime\CoreUObject\UObject\UObject) & InObject, [IMovieScenePlayer](API\Runtime\MovieScene\IMovieScenePlayer) & Player )